Roasted Pork with Vegetables

For the roast
4lb boneless pork loin roast
4 lbs potatoes peeled and cut into halves and quarters
2 lbs baby carrots
2 large onions peeled and quartered
4 cloves garlic peeled and rough chopped
8 oz package Porcini or button mushrooms cut into rough chunks (reserve 2 for the gravy)
Salt and Pepper or greek seasoning to taste
1/2 cup dry sherry
1 cup chicken broth
1/4 butter
2 Tablespoons vegetable oil
1/4 butter

For the gravy
1 cup chicken broth
1/2 cup dry sherry
2 Tablespoons soy sauce
1 tsp sherry vinegar
2 porcini or button mushrooms finely chopped
2 Tablesoons cornstarch dissolved in 1/2 cup water
Pepper to taste

Preheat oven to 350. In a large roasting pan mix the chicken broth, sherry, 1/4 cup butter and vegetable oil together. Add the potato, carrot, onion and garlic, sprinkle heavily with salt and pepper or greek seasoning. Toss the veggies in the broth mixture. Rub the pork loin with salt and pepper or greek seasoning and place fat side up on the vegetables. Cover the pan with a tight fitting lid or foil. Cook, covered for 1 hour 45 minutes. Remove from oven and carefully pour as much of the pan juices as you can into a large skillet or saucepan. Sprinkle the mushrooms and the remaining 1/4 cup butter over the vegetables stir lightly to coat and return the roast to oven and turn up to 475 for approximately 1/2 hour.
To the reserved pan juices add the sherry, chicken broth, soy sauce, sherry vinegar, and chopped mushrooms, bring to a boil stir in the cornstarch/water mixture and bring back to a boil. Season with extra pepper to taste.